Manual test: clarify Tor Browser expected user agent.

The platform part is not spoofed anymore:
https://trac.torproject.org/projects/tor/ticket/26146

wiki/src/contribute/release_process/test.mdwn

@@ -114,7 +114,7 @@ tracked by tickets prefixed with `todo/test_suite:`.
   - For the "evercookie" test to work, you may have to disable
     _uBlock_ on its web page.
 * Compare the fingerprint Tor Browser in Tails with the fingerprint of
-  the same version of Tor Browser (running outside of Tails), using at least
+  the same version of Tor Browser (running on Linux outside of Tails), using at least
   <https://panopticlick.eff.org/> (automate: [[!tails_ticket 10262]]).
   Click "Show full results for fingerprinting" to see the details
   we're interested in.